Highway Engineering
The entrance and exit curves of a rotary have

equal radii but pavement width is more at entrance than at exit curve
equal radii and equal widths of pavement
equal pavement widths but radius is more at entrance curve than at exit curve
different radii and different widths of pavement

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Highway Engineering
When the speed of traffic flow becomes zero,then

traffic density and traffic volume both become zero
traffic density attains maximum value whereas traffic volume becomes zero
traffic density becomes zero whereas traffic volume attains maximum value
traffic density and traffic volume both attain maximum value

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